Filter



Jan. 1, 1-935. J GAN 1,986,570

FILTER Filed Aug. 4, 1932 INVENTOR Jb/Ln ans 4* BY mot 425 42,5 ATTORNEY fljesasvo "Signor o C olumhia: ApplianeeGorporati-om'New Y pa-corporatiomof New York A imat on;nugtsni, mar hal n w ines ts. (Chime-"190) 1 t The present invention zrelatesiitozan:improvement.inifilterswhich.maybeiaduantageouslyemployed in connectionswithdrytcleanmg apparatus; or for other usual purposestm In a zdry cleaning practice wherein a liquid solvent is utilizedlto remove. dirtFfromwarions ki'ndsi of Eobjects, .the articles or materialsto betcleaned'are-commonly placed in thezbasket of aiwashing'machine'orr. the iii-reamirotated. through a supply-of liquid solvent. In-some iormsof apparatus for this. purpose, the

solventiscontinuously removed from thewasher, a

filteredxand: then returned to. the washer irrequal volume. In otherziorms of apparatus, thesupply of solvent; is used in cleaning-until it becomes so 15. burdened with-dirt; and therlike that. it is no longer capablebf effective use, whereupon the dirty. solvent isdrawn off 'in a ibatch;ifiltered and returned to-thewashingzmachine, w i Y p :In many; cases;.whether' related to; theydry cleaning :art :or. not, filtering. is rendered more effective by employing "whatis This material is introducedintdthe.solventor other liquid. to be filterediaridiisintendedtto. pass therewith intothe filter and tore. intercepted :by

25- the I filtering medium. lnpsomettypes of .filters,

the filter aid serves merely toiimprove. the filtering characteristic of the; filteringtmediumywhereastin other types, itis intended .aiso tosplug. up or reduce small passageways: through xzhich-zunfi'lteredrma- 30. rterial finds itswayrpasta edgesnf the filtering medium and thenceinto. the r stream ot filtered materialat-the-other 'o-fithemediump l p invention isiinte dedztoibe L appliedlto the latter typenand: moreparticularly: to embodiments thereof in which the filtercconsistsingenenalofra casing having? an inlet opening rand an outlet opening abetween which is; interposedazayfiiter bag, or bags usually of fabric or other suitableimaterial;

Animportant factor the efiiciencyzof. a filter of this type is the ease with .W'l'lifihl the-filter. bag may be removed, cleaned.andireplacedvinz efiective filtering position. Another-importantfactor is the cost er 1 the filter rbag-s 1 sowemployed. JLIn some forms 0t "apparatus :withrwhieh- I am-Lfamiliar, the filterbagsxare 'provided at-their open-end portions with insertedeeyelets. adapted to; engage with suitable supporting a or. suspending 1 devices. It is necessary, with this typeof fi-l-ten tonareiully fashion the upper end .ofthebagwsothat itamay I accurately fit .the era-operating supporting. members. V I have found-that the -:construction.;oi :bags:

suited for this purpose-andior use in filterspt this type involves considerable. expense, labor over the cost oi"- the actual materialzemployed, Moreover, unless the bags are constructed accurately and handled'with great care, their use in filtering under pressure is frequently attended with leakage of unfiltered material past the joints between the bags and the member 'whi-chsupports them in thereto.

operative positions 1' It the: nnder'stood that, where filtercaidis:employedgany leakage ofminfiltered iiquid; carries itrvarious quantities of filteritaidhdependingrcson :theeamount suspended thereinuand other 1 circumstances. While this escape of filter aidzintoi the filtered liquidmay not beim'portanti in somezoperationadt isiundesirable in; dry cleaning practice; particularly where lthE filtered asolivent is. returned :continnouslyi to the washing Pmachin? duringzw ashing operation. lIt

has-beenv found that. arelatively small :quantity :of filterqraid passingthe: filter will impairs-the efieca tiveness of the cleaning, :to; the extent-f that it appearsas athindepositofi fine dust-likeparticles on the cleaned-garments: or other :-:articleswafter they aregdried. l ItlhaS therefore 1 been anlobj set ofsrmy inventionlto providezaxnovel form of bag.

which may be made. at :lowacost and supporting means therefor whereby when the-bag: .is. oper atively :mounted: in the filter, leakage of; unfiltered liquidpast: the-bag; j oints. is substantially avoided.

. .Qnerembodiment of my invention isxdescribed' in 1 thetfollowing specification and illustrated in the drawing-appended thereto andin which- :Figuretl is a transverse;longitudinal section of arliguidfiltenin'which removable fabriobags are employed as the .firlteri-ngmedium;

Figure-lira. transversevsectiomon' the iine 2- -2 of-Figurerl; w i ..-Figure1;3; a fragmentarydetailiin section; .and

Figure- 4;-a=view;m;perspective or-aiform ofbag retaining clip; adapted. for use connection with the device illustrated; 1 i l I L Referring to the drawingrmy invention iscshown as applied-to =a filteriacomprising: a casing "1 having an inlet 21 at: itsupper-end and. an: outlet 3:"'94tf'i-tS.]i0We1- end. :.-Suitable filtering media are removably interposed between said inlet and. said outlet. In the illustrated construction; the filteriw: media-include bagse supportedat their upperope-n endsby means-hereinafter to be. described and separated from-each other andfrom adjacent side walls :of 1 the casing 1 thebottom-iwallrby ascreen l8. Suitable means, asangles eat the, bottom and aslugs '7" on or coby; screens 5 and 1 fromoperating with plate 11 .at the top. releasably retain said screens in operative position. :As shown imFig'ureqlgrtwo: screens 5 are positioned between adjacentxbags 4, .whereasta single screen 5 separates each: end. bag from the side wall. adjacent for the purposes of my invention; the bags 4 are preierablymade oi aisuitable fabric in tubular form. isE'readily cut to the required length and a-portion 10f onezend-thereof doubled back uponitself :1 and: secured .in position-by, lines of stitchingiwiiandp9-,..Figurez-3. :The :opposite end. is closed by bringing the opposed end portions of the tube into engagement and securing them in closing position by a line of stitches l0. Relatively small bags made in this manner can be produced at a saving of 50% as compared to the cost ofother types of bags of similar size .and material. v I d Where the filter requires a plurality of bags as 4, they are conveniently held in operative posi- V sitioned by the lugs '7 tion by a supporting member in the form of a plate 11 provided with a downwardly extending" peripheral flange 12 which is seated upon a gasket 13 to prevent leakage around the edge of the supporting plate 11. The bags 4 engage with suitably shaped openings 14 in plate 11, said openings being surrounded by flanges 15 extending outwardly or upwardly from the plate at an angle to the plane of the opening 14. With the bag in the. operative.positionas illustrated, its upper edge portion is bent outwardly'across the upper peripheral edge of the flange 15 and then downwardly along the outer surface. of said flange. The latter is formed with a relatively sharp corner or peripheral edge at 16, Figure 3.

. Under some conditions of use, the construction thus far described will operate satisfactorily and without undue leakage past the'joint between the bag34 and the flange 15. Under other con-' ditions, or to secure more effective sealing of this oint, I employ suitable removable fastening means for clamping'or otherwise securing the open end of the bag to the flange15. One form of such. device is shown in Figure 4 as a clip 17 of U shaped cross sectionalcontour and preferably of resilient material, as sheet brass or the like. Afterthe upper end of the bag has been bent over the edge of the flange as above de- 1: scribed, the clip 17 is pressed-into position as.

- shown in Figure 3, thus securely pressingthe upperportion of said bag into contact with contiguous surfaces of the flange 15 and-particularly against the sharp corner or edge 16 thereof.

In operating a filter as above described, the

liquid to be'filtered'is fed into the casing 1 through the inlet 2, preferably under pressure. If this liquid has suspended thereinasupply of filter aid, some is forced into the several bags 4 and deposited on interior surfaces thereof. Other portions lodge against those ends or edges of the bags which overlap and engage the flanges 15, thus eifectively sealing the joint between-the bags and the flanges during the first several moments of operation so that practically no filter aid will pass tofthe discharge side of the bag at this point. As feeding of the liquid continues, the filtered or purified liquid is withdrawn'or discharged through the outlet 3.

- After'a period of operation, varying with the amount of dirt or other material to be filtered from the liquid and with the amount of filter aid utilized in connection therewith, the accumulation of material inside the bags will reduce their filtering efiiciency to a point where they must be removed and cleaned.- Where pressure is employed, the material masses in the bags, fre-' quently in such a way as to cause to protrude or bulge laterally oroutwardly into the screen mesh openings, thus'practically looking the bags against endwise removal in relation to the enclosing means. Access is had to the interior of the filter by removing the top or cover plate. After lifting off the clips 1'7, as by means of the ears 19, the upper edges of the bags are released from flanges 15 and the plate 11 is removed, thus disengaging the upper edges of the portions thereof screens 5 and freeing the end portions of the bags. It is now possible to manipulate the. bags and screens in such a waythat they are easily removed. To reset the filter, the screens are again placed with their lower ends retained by the angles 6 and their upper ends engaged and poof plate 11. Fresh bags are then inserted as above described.

vIt has been found in actual practice that bags made as hereinabove described, besides practically eliminating leakage of unfiltered liquid, when mounted as above described, may be cleaned more readily than other types of bags with which I am familiar. Moreover, being of simple tubular shape, they sufier no harmful distortion due to cleaning or shrinkage so that, altho relatively inexpensive to make, they remain useable practically as long as the constituent fabric retains its eifective properties. I I I'claim: o 1. In a filter for liquids, the combination of-a casing having an inlet. port and a discharge port, a plurality of filter bags removably positioned in said casing in liquid receiving relation to the inlet port, a screen arranged transversely in the casing and spaced from'the bottom wall thereof, bag spacing screens resting on'said transverse screen and removably interposed between adjacent bags, abag supporting member mounted n thecasing and spaced from the top wall thereof, positioning means on said transverse screen and arranged in guiding relation to bottom portions of said spacing screens, and positioning" means forming part of said bag supporting member and engagingttop' portions of said spacing screens to releasably hold thescreens in operative-bag spacing relation.

2. A'fllter in which'removable filter bags are employed comprising a casing having an inlet end and a discharge end, a filter bag supporting member removably. positioned in the casing and spaced from the inlet end thereof, a foraminous partition arranged transversely in the casing and spaced from the discharge end thereof, a plurality of bag spacingscreens between said supporting member and said'partition, andscreen positioning'means on said supporting member and said partition respectively adapted to engage'end portions of the screens tohold the latterin bag spacing relation. 3. A filter according to claim'2 and wherein two separate screens are interposed between adjacent bags.- i v I 4. A filter according to claim 2 and wherein the screen positioning means on the bag supporting member include projections extending toward the foraminous partition.

5. Filter'appa'ratus comprising acasing, a bag supporting member re'movably positioned there'- in, a plurality of open 'end filter bags arranged with their open end portions detachably engagingsaid bag supporting member, separate screens interposed between adjacent bags, said bag sup porting member having screen positioning means adapted to engage edge portions at one end of the screens to hold them in bag supporting relation and to disengage and release said screens when the bag supporting member is removed, and screen positioning means arranged to engage edge portions of said screens at the opposite ends thereof.

JOHN GANS. 

